Here's one that may or may not be normal. I know it has nothing to do with intelligence. My wife is a certified member of Mensa (98th percentile or higher on a standardised, supervised IQ or other approved intelligence test.)-obviously off the charts bright. She doesn't know left from right. When we drive and I'm asking for directions she will say turn left here. I do and she says I meant right. I can't count the problems this has created on our car travels. If the GPS says turn right she will use her left hand and the reverse as well. Her excuse? "hey I've always been that way".
